Transmission system for statistical data



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` ATTORNEY s Sheets-sheet 2 Sept. 3, 1940. j -J. w. BRYCE TRANSMISSIONSYSTEM FOR STATISTICAL DATA n Filed oct. 19. 193e mlm kwz .6sheets-sheet 3 ATTORNEY J. w. BRYCE TRANsMissIoN SYSTEM Foa sTATzs'rIcALum.

Filed oct. 19. 195e Sept. 3, 1940.

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y Sept. 3, 1940. J. w. BRYcE TRANSMISSION SYSTEM FOR STATISTICAL DATAFi1ed ,oct. 19, 19:53 6 sheets-sheet 6 FIG.6.

INVENTOR rekenen sept. 3. 194.0

UNITED STATES PATENT GFFICE James W. Bryce, Glen Ridge, N. J., assignerto International Business Machines Corporation, New York, N. Y., lacorporation o3 New York Appueenen oeteber 1s, 193s, serial' Ne.'-235,820

9 c1eime. (c1. 17e-2) iIi'his .invention relates to transmission systemsfor statistical data and has for its general object the provision ofmeans for-verifying data transmitted from a sending station to areceiving and recording station to determine the accuracy of receptionby the receiving station as.l

a condition precedent to the recoy of such data'at the latter station..O nee orm of such means lfor verifying the data is disclosed herein,another form being shown in my copending application No. 235,819, and'still another form in Amy co-pending application No.4235,821.

More speciiically, the object ofthe present invention is to providea'remotely controlled data recording system with novel means forchecking the' accuracy of such data, character by character, as aprerequisite tothe recording thereof. Thus, by preventing the recordingof a data character at a" secondary station until after it has beencompared for .accuracy with the original data at a primary station, theinvention -attains the object of avoiding recording of inaccurate -dataat thev remotely controlled recording station.

'Another object of the invention resides -in the lprovision of aplurality of novelly arranged com- .paring circuits both at the sendingor primary station and at the receiving or -secondarystaacter to areceiving means at station A to be compared with the original characterprinted'there.

If there is any agreement, the comparing means 4becomes' fullyconditioned ang causes a repeat transmission ofthe character impulses tost ation 5 B. In the event-of a lack of agreement, which is determinable`by Visuahcomparison of the printed characters at station A, an adjustkey must be operated' to send out control impulses to eiect properadjustment ot station B with lo respect to station A. Assuming, however,that the printed characters at station A agree, thn the repeal?transmission of the character impulses to station B completes theconditioning of the comparing unit at the latter station." If '15 thesystem is still in agreement, printing and punching of the character atstation Boccurs. Should the comparison be in' error, an adjustl key atstation B is depressed to send control im- :y pulses to adjust stationAwith respect to stazo tion B. Under no condition may an incorrect tionfor eiecting verification ofthe transmission of data. I

` The Objectis further to provide a novel ,transmissionsystem in which adata character transmitted from a first station and received at'a secondstation causes the operation ofverifying ments asv to the scope means atthe first station to initiate a repeat 'transmission of the characterfrom the rst sta-f tion, said repeat character transmission operatingverifying 'means at the second station which in turn controls theoperation of a recording means for recordingthecharacter at'the secondstation.

According-to the present invention, a contact control key at a station Ais operated to send out a series of impulses which cause a record cardto be fed into punching position at asta-v tion B, located at a remotepoint from station A. A character key is then depressed to print thecharacter at station A, and at the same time to partly condition acomparing means at the latter station. Multiple impulses representingAthe character as sent to receiving means at station B and there partlycondition a second comparing means. The comparing `means at station Blcooperates with a transmitting means at that station toeffectretransmissionof the char-` Fg. 1b is a timing chart gram shown inFig. 2a.

. character wbe punched at station B,'because of' the comparisonrequired prior to the setting. up ot the punching means.

Further objects of the instant invention -re- 25 side' in any novelfeature of construction or operation or novel combination on partspresent in thev embodiment /of the invention described and shown in theaccompanying drawings whether within or without the scope of theappended 30 claims and irrespective of other specific state- A.

of the invention'contained herein. Inrthe drawings:

Figs. lfandI 1a are representative circuit dia- 35 'grams of.v the,transmitter and receiver respectively atstation A. n

for Vthe circuit diagram shown in Fig. 1.

Figs. 2J- and 2a are representative circuit dia- 40 grams of thereceiver and transmitter respectively at station B.-

Fig. 2b is a timing chart of the circuit dia- Flg. 3 is a plan view of aportion of the trans- 45 mitted. key board. v

Fig. 4 is a sectional view taken at 4-4 oflFig. 3. Fig. 5 is a sectionalView taken at 5-5 of Fig. 3,

`showing a transmitting key and the various operating mechanismassociated therewith.

Fig. 6 is'a view of the dash pot control mechanism which is applied tocertain relay contacts in the various circuits of the system.

Fig. 6a is a detail plan view of the mechanism associated. with thedashpot- Fig. 'I lis a detail view of,a portionof the punching mechanism.

A preferred embodiment of the invention will now be described-withreference to the accompanying drawings. At station A a special keyboardis provided as shown in Figs. 3, 4 and 5. Seven keys are shown asrepresentative, three of them being allotted -to numerical charactersand the remaining four being provided for various control operationssuch as space control, card feed, verifying, andadjusting. If more thanthree different numerals are to be transmitted more numeral keys areadded, but the four control keys are suilicient regardless of anincrease in the numeral keys. Depression of any of the keys causes theoperation of a special set of contacts associated therewith so as toinitiate a correspondingo impulse or series of impulses. If a numeralkey is depressed, it also causes printing of the numeral by energizing aprint solenoid'associated therewith, all of which will be described indetail hereinafter. The

mechanism illustrated in Fig. 5 in association with the adjust key I1 issimilar to that for the other keys. It is seen that the depression ofkey I1 causes an-insulated conducting portion |1a to bridge the contactsprings |1b. A notched projection |1c at the same time cams latch bar I9to the right and then allows it to return to the left again under springaction so that the left extremity of bar I9 is positioned above thelatch point on projection |1c to hold the key down. Then at a latertime, as will be described later, solenoid I8 becomes energizedmomentarily tomove the latchbar I9 to the right away from projectionI1c, thus releasing the key I1 and allowing it to raise to its normalposition under the urging of its return spring |1d. It will be notedthat only one key may be depressed at a .time due to the presence oflocks Se (Fig. 4). When a key is down it maintains the locks ad- Ajacentthereto spread apart so that the combined clearance of the.v locks 9 istaken up dand no other key may be moved down between them. Thisstructure is elementary and similar to that used in key-operated punchesto prevent the operation of more than one key at a time so that nofurther description is believed necessary.

A transmitting commutator 2| (Fig. 1) and a rotatable arm 2| are alsolocated at station A, arm 2| being maintained continuously rotating Vina clockwise manner at uniform -speed by any suitable means such as anelectric motor (not shown).

" 'I'he speed at which this arm is to rotate is detercuitsaresuccessively closed depending upon -which of the keysA II to I1 wasoperated to eil'ect the transmission of a predetermined number ofimpulses from the transmitting device I3. The circuits will be'describedin detail later.

The mechanism actuated at the receiver of station B by the incomingimpulses comprises a chain system of multiple contact relays RI to R1(Fig. 2) which control the/selective energization .of a plurality ofprint solenoids, such -as the one designated- 52 for example. Solenoid62, upon becoming energized, pulls its armature 52a and the key leverconnected thereto down so as Vto (-perate a printing mechanism which isdiagrammatically represented by a platen 51, a hammer 51a, and suitablelinkage 51h connects@ between the hammer and the key lever. Motiontransmitted through the linkage 51h causes the hammer to be moved towardthe left to strikethe platen. The leftward movement of the hammer closesa contact 62h to energize a punch solenoid 12 by a circuit to bedescribed later. Punching mechanism of any convenient type such as shownin -the U. S. Patent No. 1,772,186 to F. L. Ice et al., for example,may. b e employed. Printing and punching under solenoid control are oldinv the art, and therefore therepresentationof the printing and punchingmeans illustrated in Fig. 2 and Fig. 7- respectively are believedsuflcient.

In Fig. 7 an interposer 11 is moved to the left under control of asolenoid (not shown) so that as motor bar 'I8 is moved down sharply onthe in- Vterposer 11 by the energization of the punch magnet (not shown)the punch 80 will be moved down to pierce the card C. Return springsinsure the restoring of motor bar 18, the nterposer 11, and the punch80, and the usual escapement action .advances the card C to the nextcolumn.

An impulse means comprising a commutator 2l and an arm 25 is provided atstation B and there. cooperates with a transmitting device |25 to eiectthe resendlng of character impulses to station A. A chain system ofrelays forms a receiving means at station A similar to that alreadydescribed for the station Breceiver. Arm 25 is rotated in a uniformmanner by means similar to that for arm 2| but not necessarily at thesame speed.

Although the commutators at stations A and B do not run in synchronism,there' is a certain time controlled relationship between the receivingportion of each of these stations and the transmitting portion of theother. This comprises a control relay 55-at the receiverof each stationhaving dash pot mechanism generally designated ,54 (Fig. 6) associatedtherewith to control the time of closing of a plurality of sets ofcontacts including those designated 55h, 55e, 55d, and 55e.

Relay coil 55,.upon becoming energized attracts the armature 5 so that acylinder 5a attached to .the vright extremity of the armature is moveddown forcing air out through an opening 1 in the dash pot 5l. It is seenthat the speed of operation of contacts 55h, 55e, 55d, and 55earedependent upon the size of the opening 1 which is-ad justable in amanner to be explained presently. When the relay coil 55 is deenergized,the outside air rushes in through the opening 8 and the armature isallowed to restore quickly under spring action and return the abovecontacts to their normal position.v

The size of the opening 1 is manually adjustable by turning knb 5 whichis xed to a threaded shaft 8. Automatic means for rotating .the shaft 5in either direction is also provided so as to speed up or slow down theclosing of the contacts under control of e dash pot mechanism.' A trainof gears, generally designated l, connects the shaft 5 for operation bya differential device 6i actuated by a pair of pawls 9|, 9 2 andratchets 55a, 56h. The shaft 6 forms a frictional mounting for one ofthegears of the above train. The ratchets may` be locked orreleased/according to the position of a pair of cooperating detents 2and 3. 'Ihe detents are normally in the position shown in the drawingsand are mounted on a common shaft 'I. A Asolenoid X controls theengagement and disengagement of the detents. When detent 2 is disengagedfrom ratchet 66a,

detent3 is engaged in ratchet 66h. A magnet |35,

when energized, causes the pawl 9| to feed ratchet' 55D clockwise onetooth. A'magnet |36 coopero transmitted through the gear train 4 to turnshaft 6 clockwise thereby decreasing the size of the opening 1. Thus,ratchet 66h is operated in the direction indicated by the arrow to speedup dash potacticn and ratchet 66a. is operated to slow down this action.The solenoid X is located in series with magnet |36 and is energizedwhen the latter is energized soas to release the ratchet 66a. Ratchet66D is normally free of detent 3 so that solenoid X need not be operatedupon the operation of magnet |35. dash pot control mechanism and theautomatic adjustment therefor will be explained in' connection with theexplanation of the circuits and operv ation of the system Which nowfollows.

At -the start it is assumed that the printing means comprising twotypewriters at station A and one at station B have paper insertedtherein and that the punch at station B has a pack of fresh record cardsin its hopper, and that the two stations are in adjustment which isdescribed later. It isiirst necessary to feed a card fromA the hopperbetween the die and stripper of the punch tor apuncliing position. Thisis accomplished by transmission of a predetermined number of impulsesfrom station A to station B. These impulses cause the energization cfaselected control magnet of the chain relay system already describedwhich in.turn causes the punch clutch magnet to" be energized'in amanner to be describedpresently. A key I5A (Fig. l), referredto as thecard feed key,is depressed (see Fig. 5 and Fig. 19 to initiate the aboveoperation.

The depressionof the card feed key |5 causes I N conducting portion |5ato bridge contact springs l sition, wire 28, contacts 35a now closed,relay.

|5b and complete a circuit to connect relay coil 35 directly across theline. Relay 29 also becomes energized by a circuit from righthand sideof the line 21, contacts |50a in their normal pocoil 29, to left handside of the line 26.2 Relay 29, whenenerg'lzed, closes its contacts 29which in turncomplete a circuit to energize clutch magnet 40 as follows:right hand side of the line 21,

-contacts 29a now closed, clutch magnet 40, to leftfliand side ofthe'line 26. The energization of magnet 40 causes the cam associatedwith contacts CC-3 to be clutched in for rotation with the, same shaftwhich carries arm '2|, Cam CC-3 therefore now rotates in synchronismwith the arm 2| from the D positionl onward. Near the end of the nextcycle, the camA causes the closure f its contacts CC-3 for a purposewhich will be explained later. It might be well tomention herevthat thedepression of any of the keys to I1 causes the clutching' in of the CC-3cam to the commutator shaft and the energization of relay coil 29. Y

'The energization of relay 35 upon depression of the card feed key I5causes the closing of conj tacts 35a and c-gt A- circuit completedthrough contacts 35a at .the time aim 2| contacts segment a of thecommutator 20 in the following manner: from line 21, contacts |50a Thepurpose of -the intneir normal posicion, wire 2s to contacts asa nowclosed, `relay coil 39, contacts 39h, commutator segment 20a, arm 2|,`to line 26.Relay coil 30, upon becoming energized by the" abovecircuit, closes itscontacts 30a to cause the energization of relay coil38 from line. 21, contacts 30a, relay coil 38, to line 26. The holdingcircuit for relay 38 is through contacts' '38a now closed and camcontacts CC-I. As previously mentioned, the CC cams are driven at thesame speed commutator 20, the CC cams are in the we llknown D positionas illustrated in the timing diagram (Fig. 1b). Relay 38 is providedwith. contactsl 38h which are located in series With lthe transmitter 43and are normally open. Thus, itv is seen that transmission'may beeffected only when the .energization of relay coils 3|) .and 38 hasoccurred previous to the passage of arm 2 -over the various transmittingsegments of the commutator 20. y

With relay 38 energized, a series'of impulses may now be transmitted.The transmitting circuit is from line 21 through resistance 4|, contacts38h now closed, wire 42', contacts 35g nowclosed, relay coil 45, segmentspot 20h, arm 2|, to line 26. The flow of current through resistance 4|causes a potential drop yacross it which is im'- pressed Aupon the inputof the Atransmitter 43 to cause an impulse to be sent out from station Ato station'B. Relay 45, upon being energized by the previously tracedcircuit, closes its contacts 45a to energize relay coil 44 from line 21,through relay contacts 45a, through relay coil 44, to'line 26.' Relaycoil 44 is then held energized through its contacts 44a and cam contactsCC-2 until the end of the transmitting period (see timing4 Following thetransmitting portion of the cycle a circuit is completed to energizerelay coil 39 by means of the arm 2| from line 26, through arm-,2|,through segment spot 2011, throughcon-A .tacts 44b now closed, relaycoil 39, to the other side of the line 21. .Relay vcoil 39 is heldenergized through its contacts 39aV and relay contacts 29h now closed.The energization of relay coil 39 by the above circuit opens itscontacts 39h and prevents energization of the relay coil 30 should thekeyA I5 remain depressed for another machine cycle.l 'I'his effectivelyprevents transmission of a repeated series of impulses for the samed'epression of the key. Key l5 is released near the end of the cyclewhen cam contacts C'C-3 close to energize relay' I8, which shifts latchI9 (Fig. 5) to permit key I 5 to move upward under'spring action inthesame manner as illustratedl for key I1. If the operator, however, hasnot yet released key I5, the shifting of latch 9 has no` the nextkey'depression, a new series of impulses may be transmitted.

l0 as arm 2|, and when the arm 2| is at line D of `will be explainedlater..

lThe ve impulses transmitted in the manner .ust described are receivedat station B and effect a card feed there as follows: Upon reception ofeach impulse at station B (Fig. 2) the receiver 50 is actuatedaccordingly and causes the energization of relay coil 52 for eachimpulse.

vCoil .52 closes its contacts 52a upon each energization.

The first impulse completes av circuit fromline 46, relay contacts 52anow closed, through center and upper relay 'contacts 5|a, Rlb, R217,etc., through R1b, wire49, relay coil 5|, and back to the other side ofthe line 41. Relay coil 5| then shifts its make before break contacts5|a, that is, the center and lower contacts make before the center andupper break. Coil 5| thus remains energized for the duration of the rstimpulse through relay coil 52. Contacts 5|b close and cause theenergization of relay coil RI from the left-hand sideof line 46, throughcontacts 53a, contacts 5Ib, contacts Rla, relay coil Rl, to line 41.Relay coil RI is maintained energized through contacts RZd, the holdingcircuit being from line 41, relay coil Rl, transferred contacts Rla,relay contacts R2d, contacts 53a, to line`46. The contacts Rla are alsoof the and 63a. A,

A plurality of contacts are operated u nder the control of relay coils55 land 55 Those operated by coil 55, including contacts 55h, 55e, 55d,and 55e, are provided with dash pot control mechanism as alreadydescribed. Contacts 55'a and 55'1, which are operated by` relay coil55',

aresnot dash pot controlled. The purpose of the dash pot is to preventany oneof the chain relays from being energized ton effect control untilthe completion of the time during which all possible signal impulseshave entered the chain relay group. Accordingly, the adjustment of thedash pot is ,such that contacts 55h do not close until the arm 2| atstation A has contacted the segment spot 20m, Theadiustingcircuits T 'henextvimpulse which entersthe chain re- 'lay group causes theenergization of relay coil R2 by the following circuit: from line 46,relay contacts 52a; relay contacts 5Ia` in the position shown. relaycontacts Rlb in a transferred position, relay contacts R2a, relay coilR2 in the position shown,to line 41. Relay coil R2,

uponlbelng energized, shifts its a, b,- c and d contacts. The shiftingof the R2d contacts, which are of "make before break type previouslydescribed, transfers the holding circuit for relay RI back throughcontacts 52a. Therefore,`u pon opening of these contacts, relay Rl isdeenergized. Relay R2 is held energized through contacts R2a and R3d.-In a similar manner each successive impulse` entering the chain causesan energization of a new relay and deenergization of the previous one.When the ve y to the punching position.

close its contacts 61h. The closing of contacts 61h, to line 41. 'I'hedepression of plunger 61a also closes contacts 61e causing'relay coil 53to become energized by a circuit from line 41, contacts 61e, relay coil53, to line 46. Relay coil 53, upon energization, opens its contacts 53ato deenergize relay R5, and also opens its contacts 53h to deenergizerelay coil 55. With the energization of relay` coil' 68, contacts 68a,Jclose to complete a, circuit from line 46, through contacts 68a, throughthe -punch clutch magnet 10 and back to the vright-hand side of line 41.Energization of punch clutch magnet 10 shifts contacts 69 to, energizethe punch motor 65 by completing-a circuit thereto from the left-handside of line 46, through contacts 69, through motor 65, and back to line41. The punch motor65 then op.- crates to effect the feeding of a newrecord card Station B is now ready to receive the impulsesrepresentative of statistical data from station A. One of the digit keysat station- A, for example,

' key I 2 (Fig, l) is now depressed and closes its "make before breaktype. Relay contacts-5w associated contacts 12b in a previouslydescribed manner to effect the energization of the relay coil 32. Theclosure of contacts 32h then completes a circuit from line 26, throughcontacts -32b now closed, through typewriter solenoid S2 and back to theright-hand side of line 304. Energization of solenoid S2 causes printingof the numeral 2 at station A. Closure of contact 32a causes a pickup ofrelay 30 and also relay 38 as previously described so as to prepare thetransmitting cir- 1 cuit. Closure of contacts 32e and 32d then permitstransmission of two impulses from station .A to station B,thetransmission of these impulses being e'ected in the Vsame way as forthe card feed impulses. The energization of coil 32 as described abovealso brings about the energization of a comparing relay 202 (Fig. la)which is one of a group of relays forming la comparing unit at stationA. The circuit is from line 46, contacts 32e now closed, relay coil 202,conductors 22 and 23 to line Y41.

At the completion of the,transmitting portion of the cycle, arm 2|(Fig. 1) engages seg-v ment 20s to complete a circuit from line 26, arm2|, segment 20s, contacts 38o now closed, relay coil |61, to line 21.ergized through parallel contacts CC-S and |6012. Contacts |61b close toprovide a -circuit to connect relay coil withcommutator segment 201 asfollowsn from line 21, relay coilV |60, contacts 38d now closed,contacts |611, to commutator lsegment 201'. The latter circuit is notcompleted to the other side of the line at this time, since arm 2| hasalready passed segment 201'. This circuit functions in conjunction withthe comparing relaysy at station A in a manner to be describedhereinafter.

To continue with the example, at station B relay coll R2 becomesenergized upon the reception of two impulses from station A and, at thetime dash pot contacts 55h close, a circuit is completed from line46,contacts 55h now closed, receiving switch 56 now closed, contacts`R2c ina transferred position, coil |52, to line 41. This circuit energizes thecoil |52 which then closes its contacts |52a (Fig. 2a). As a result, alcircuit i's completed to energize a -comparing relay coil 232 asfollows: from line 46, contacts |2011l now closed, escapenient contacts58', center and lower contacts 248D, relay coil 30|. 'conductor 302,

Coil |61 ismaintained en- .61b completes a circuit to energize relaycoil 60 as follows: from line 46, relay coil 68, contacts relay coil248.is energized, contacts 24817 transtheir normal position, contacts R2c now transing`relay coil 2|2.

41.` Contacts 232e then close to energize relay coil 262v by the circuitjust traced as faras coil then via conductor 303'to contacts 232cnowclosed, relay coil 262, to'line 41. Upon enrgization of coil 262, therelay 26| also becomes energized because of the closing of contacts262awhich places coil 26| in parallel with the coil 262. In like'manner ifthree impulseshad been received, instead of thetwo assumed forthe'example, coil 263 would have'becom'e energized and caused both coils2 62 and-26| -to be placed in parallel with it. The eiect of the aboverelay arrangement-becomes apparent from' the description ofthe circuitsfor retransmitting im' as arm 25 contacts segment 24a, the transmittingcircuit is completed as follows: from line 46, contacts 55g now closed,arm 25, segment 24a, contacts 26|b now closed, |08b now closed,resistance '||2, to line 41. The potential drop created acrossresistance ||2 causes transmission of an impulse from transmitter |25 tostation A. The transmitting circuit is again completed when arm 25 engagessegment24b, sincecontacts 262b are closed,

and thus a second impulse is transmitted back to station A.

, At the termination of the sending portion of the cycle of commutator24 and arm 25, the latter engages segment 24j and a circuit is completedthrough relay contacts |08c now closed, to energize relay coil 248which, upon becoming energized, is held through-its contacts 248a,escapement contacts 5 6', and contacts |2011. When the fer and therebybreak the circuit to the 26|, 262, etc. coils and provide a. new circuitto the 24 242, etc. coils which becomes effective at al subsequenttimein a mannerto be described later. Then, when the arm 25 engagessegment 24g, a circuit is provided through contacts |0811, now

closed, to energize relay coil 231. Contacts 231d (Fig. 2) close toenergize relay coil .53,j The energization of coil 53 opens contacts53a, 53h and thereby deenergizes relay coils RI, R2 and 55,

At st ation A, the .two impulses sent 'from station B are received inthe same manner already described for the receiving of the original twoimpulses at station 'Bs Thus, relay R2 at stationy A is energized (Fig.1a) and, when contacts 55h .close, the energization of coil |12 iseiected concurrently with the energization of typewriter solenoid S" 2by a circuit from line 46, contacts 55h now closed, receiving switch 56,R|c contacts in ferred, relay coil |12, solenoid S2 to line 41. Thus, asa result of solenoid S'2 becoming energized, the character 2 is printedon a second typewriter at station A and the circuit which caused thisprinting also causes theclosing of contacts |12a in the comparing unitat the latter station to bring about theenergization ofcompar- As coil202 has been energized previously in a manner described hereinbefore, acircuit is completed upon the closing of the 2|2b contacts as follows:from 'line 46, relay coil |50, contacts20`2b now closed, contactscontacts |52a now closed, *relay coil 232, to line vmanifested in thefollowing manner.

2| 2b also now closed. relay coi1222,'to line 41. Relaycontacts 2 22a(Fig. 1) close and contacts l60aare shifted upon the energization ofcoils 222 and |50` by the circuit just traced, and the way is preparedfor an automatic repeat transmission of the impulses from station A tostation B.

To effect a repeat transmission, one of the re-l lays 3| to 34, in thiscase 32, is energized by a circuit completed from line.21, contacts |50ain `the shifted position. conductor |43, contacts 222a now closed, relaycoil 32, to line 46. Contacts 32a to d now close and transmission iseffected in .conjunction with commutator 20, arm 2|, and

. transmitter 43 in the previously described manner. Thus, two impulsesare sent once more to station B. At the completion of this secondtransmitting operation, arm .2| engages segment 201' and completes the.circuit to energize relay coil |60. The circuit was already conditionedfor energization bythe closing of contacts |61b and.

33d, as .previouslyy described, during the rst transmitting operation.Upon energization of relay coil |60, contacts I60a close to provide aholding circuit for this relay in conjunction with cam contacts CC- 1,now closed. The energization of relay |60 also effects thedeenergization of the comparing relays 202 and 2|2 because of theopening of contacts |60c (Fig. 1a). Contacts |60b (Fig. l) also openand, when'cam'contacts CC-5 open, the circuit to relay coil |61 isbroken.

Considering now the second reception of the impulses at station B, relayR2 (Fig. 2) and coil |52 are again energized in the usual manner and,with contacts 2481 (Fig. 2a) now shifted, contacts |52b close tocomplete a circuit to energize a comparing relay coil 24|. This circuitis from line 46, contacts |209, escapement contacts 58', contacts 246|)inltheir shifted position, relay coil 300, contacts |525 now closed,relay coil 242, to line 41. As relay 232 was energized on the r'streception of the impulses, when relay 242 becomes energized a circuit iscompleted from line 46, contacts 2321) and 242D, both now closed, relaycoil 252, to line 41. The circuit just traced energizes y -cause thepunching of a 2 hole in the record card C in the u'sual manner. Thepunching operation causes a shift of the escapement'contacts 58' (Fig.`2a) to deenergize the comparing relays 232 and 242, and also'relay 248.Y 5

If. there is a lack of verication at' station B on the secondtransmission,the error will be The origi` nal transmission of impulsesfrom 'A to B enerjgizes relay 30| temporarily, as already explained,

during the energization of comparing relay 532. Contacts 30|a close toenergize relay coil 304 by a circuit from line 41, coil 304,.contacts30|a now closed, conductor 301, to line 46. A holding circuit is nowestablished for relay 304 from line 41,

contacts 304a now closed, contacts |20m; through a series parallelarrangement 'of normally'closed contacts of the comparing relays 23| to234 and 24| to 244,I conductor 301, to line 46. 'The repeat transmission.of impulses from A to B causes relay 300 to become energizedmomentarily during thepickup of the comparing relay 242. When' contacts300a'close, relay 305'is energized in a manner similar to that desribedfor relay 304; A Relay 305, however, may or may. 'ot be held ener-.gized through the series parallel circuit of` comparing relay contacts,depending upon anagreement or lack of agreement between the firstreceived impulsesand the repeat impulses. Thus,

ment and a parallel portion, of the holding circuit is opened todeenergize bothrelays 334 and 335. In the event that there is a lack ofagreement, for example where 232 and 243 are energized, the relays 384and 335 will remain enerand contacts 334D and.3lb complete -a circuit toenergize a bulb 3 I3 which may be in the form of a red indicating light.If this light is energized and remains energized, it is an indication:it station B that the system is in error.

Accordingly, (an adjust key V|34 is depressed at station B to eifect thesending of adjusting im- -pulses to station A in a manner to bedescribed hereinafter. Relay coil |23 becomes energized and is heldenergized through contacts |2Ia nowclosed, and contacts CC-S and |33d inparallel.

, Contacts |2lm open to drop the holding circuit to coils 304. and 335,and contacts -|2lp. opento vdeenergize coils 243 and 232,242, thusrestoring the B station` to its normal receiving condition..

Wie: it is desired to space' between characters, the ce key |4 (Fig. 1)is depressed to send out four to station B, there to energize relay R4in the usual manner. The comparing unit at each station 'checks thesefour impulses by the same method whichwas described for charactertransmission before permitting space solenoid 34 vto become energizedto` space the typewriter. A solenoidlll then beciies energized as'contacts 34h close tospace e record .card in the punch.'` 1

It is fev-be 'especially noted ni the above description that a doublecomparison is made for each. character transmitted before that characteris permitted to be punched in a recordcard.l

' The first comparison is eifected at A Awhere the retransmittedcharacter impulses from station B are compared with the originalcharacter impulses. This comparison is visual, that is,

by an observation of the printing of the character by the twotypewriters at stations A. Then, the

Vsecond. comparison is made at station B when the repeat transmissioncharacter impulses are compared with original character received at thatstation. The second comparison for accuracy must show an t, otherwiseared signal is made to glow at station B.

In starting Operations and at various times,

- such as when the comparingunitsvshow a lack sentative of thetransmitted signal,and no relaymust become effective until the time forpicking up the last relay in 4the group has beenpassed.

This timing is eifected by dash pot controlled relay contacts, theadjustment for which will now be described.

These contacts at station B which "are dash. controlled must closewithin a period determined by the speed of rotation 'of the transmittingcommutator at station A. l'hat is, the rst of a series of impulsestriggers off the dash pot relay Il. 'Ihe contacts controlled by thisrelay must not function before the time passed tion A is contactingsegment spot m.

' contacts R'Ig,

where relays 232 and 242 are energized 'by the respective sets ofimpulses, there is an agreewhen the last possible transmitting signalimpulse might be received from station A.

Therefore, since the first impulse from station of closure of thesepoints is checked byan. additional impulse following the time of 4signalimpulses, it is possible to determine if the adjustment is correct ornot on the dash pot relay. Means is provided to automatically effectcorrect adjustment at station B by theslgnal ofadjustment from station Aand likewise station B to A. For thev machine to be in adjustment, thecontacts h must close following the completion of the signal impulsesand while the arm 2| at sta- When starting up sending operations, forexample, each morning prior to beginning trans- .s triggers on. the dashper relay at 13, 1f the time s vns' mission, the operator at station Abegins the adjusting operations. Operator at station A depresses theladjusting key .and operator at B opens receiving switch I3 prior toadjusting to prevent printing. Depression of key |1 effects the tron ofseven impulses' to station B and energization of relay R1 at thisstation in thecustomary manner. Sets of contacts llc,

55d,.and 33e are operated concurrently with contacts Sib f or testingthe adjustment, and contacts 55'! concurrently with ll'a.. The segment-s'pct 23m whichis used for adjusting purposes is longer than any of the`other segment spots'.4 This is to hold-relay R1 energized for anappreciable period and allow some tolerance in the adjustment of thedash pot relay. Relay R1 is not pro- Vvided with the usual holdingcircuit through con-Q tacts at station B. Hence, relay R1 is energizedonly while the'arm 2| contacts segment 23m. It contacts c close while'relay R1 is energized, the dash pot (Fig. 2) controis in adjustment anda circuit iscompleted as follows: Line 43,

relay contacts c now clod, relay contacts R`|` now closed, contacts|3|c, coil |33, to line4'l. Relay |33 upon energization is heldenergized through its points |33a and relay contacts Ild and |231'.Relay contacts |330, in closing, `light a green lamp in the holdingcircuit which informs the operator at station B that his machine is lnadjustment. Also, relay 33 is energized to open its 33a contacts anddrop relay il. Operator atlvlrouldthcnbegin'sendinganadjusting impulseto station A to', operate similar circuitsatthelatterstationinamannertobedescribed IfthedashpotcontroIatstation-Bistoorapid, the sequence of events is as follows: '111e contacts IlebecomeLV closed before the adjusting impulse opens contacts Rig andrelay coil- |3| is energized by a circuit from line 43, contacts 35e, Yrelay coil |3|, to-line41. 'Relay coil |3| is held energized throughcontacts |'3Ia and contacts Bld and |23r. C ontacts'l3lb close toenergize relay coil |32 when R'lh'closes, coil |32 being thenheldthrouslvcontacts |324, 3|d and mr. Relay contacts ma, in elmg'ught a redlamp in the holding circuit to show that the adjtment is not correct.

rrthedasnpeteenxrelattaenaisteoslow contacts R1! operi and close beforecontacts lid open and thus relay coil |34 is energized. Also,

.een |3| is energized, but een m is not enemies at this time. A redlight in the holding circuit indicates machine is still out ofadjustment. The energlzation of coil |34 automatically eifects anedjmunent or the dem por. mechanism te speed up the relay action'byclosing points |34b and.

energizing the adjusting magnet |35 (Fig.- 2a) action vby increasing thesize of the opening 1 as has been previously explained. Closure ofr 32hpoints energizes magne't |36 to slow up the dash pot action by causing aclockwise rotation of shaft 6.

To transmit an adjusting impulse vfrom B to A the adjust key |04 isdepressed to energize relay coil (Fig. 2) .1 Relay |20 is then heldthrough its contacts |200, and normally closed contacts |3811 inparallel 'with CC-6.. The I20e contacts- (Fig. 2a), in closing,cooperate with the 'shifting of contacts |20b to provide a circuit forpicking up relay coil |38 when'arm 25 contacts spot 24j. The |3812contacts then close to provide for transmitting the adjusting impulsesthrough the contacts 1201, g, h, k, m, and the transferred contacts |20cand d. An impulse circuit mayybe traced as follows: from line 4'contacts|20d in a shiftedposition, resistance H2, contacts |20c.

in a shifted position, contacts |38b now closed,

contacts |20f, |20g or |20h, etc., now closed, corresponding commutatorsegment 24a, 24b,x or 24e, etc., arm 25, contacts |20eto line 46. Thelast impulse occurs when arm 25 is on segment 24e and effects adjustmentat A in a manner similar to that already described for station-B. Theoperator at'A seeing his adjusting lights dashing knows station B is inadjustment, and that he` may discontinue transmission of his adjustingsignal to station B. Station A ,being in adjustment, the operator theresends back a single adjusting impulse to station B which indicates thisfact to the B operaton The relays time.

Relay coil becomes deenergizedl when' the Isolenoids |35 or |36 shifttheir associated ratchet arms 9| and 92 so'as to opencontacts B0 or 6|.

When the adjustment is correct, pickup of relay Coil 63 (Fig. 2) opens6341"'(Fig. 2a) to drop coil 55. While oo il 63 is energizedthe holdingcircuit of coil 55 is open, and it is necessary. therefore that `coil5|, when energized/remains in its operated condition long' enough todrop coil 63. Coil 5| is thendeenergized in a previously describedmanner and its. contacts 5Ic close to pickup coil 55 once again,

While there hasfbeen shown an'd described and pointed out the.fundamental novel features of the inventiontas applied to a singlemodification, it Willlbe understood that various omissions andsubstitutions and changes in the form and detailsof the deviceillustrated and in its operation may be made by those skilled in the`art without departing 'from the spirit of1 the invention. It is theintention therefore to be limited only as indicated by the scope of thefollowing claims.

.What is claimed is: y

1. In a data recording and checking system, aY transmitting stationincluding therein means to transmit multiple primary impulsesrepresenting digit values, and a primary value checking means partlyconditioned by and in. accordance with transmitting station includingtherein primary `combination with a receiving vstation having .sented bythe secondary impulses with the data Acharacter represented bytheprimary impulses,

lmeans to send primary impulses again'to the `a -receiving stationembracing therein means re- -operation of the impulse responsive means,a ysecondary sending means controlled by the energized relay of theprimary matching unit, means the first operationof the transmittingmeans;

in combination with a remote receiving and re`- cording station havingtherein means responsive toJ the transmitted impulses, a secondary valuechecking means partly conditioned by and in accordance with theoperation of the impulse responsive means, return impulse meanscontrolled by the partly conditioned verifying means for returningsecondaryimpulses representing the digit value tothe transmittingstation .to complete the conditioning of the primary value checkingmeans for checking the values represented by the secondary impulses withthe values represented by the primary impulses, means controlled by thefully conditioned primary checking means for eiecting a secondoperation'of the transmitting means. to send primary impulses again tothe receiving station to' cause the full conditioning offthe secondarychecking means, and perforating means at the receiving station renderedeiective by the fully conditioned secondary checking means, means forrecording the .digit values on a record at the receiving station.

2. In a data .recording and comparing system, a

means to transmit multiple impulses representing a data character, a.primary data comparing ineans partly operated by and in accordance withthe first operation of' the transmitting means; in

therein means responsive to the transmitted impulses, a secondary datacomparing means partly operated by and according to the operation ofthem impulse responsive means, a secondary sending means controlled bythe partly operated secondary comparing means for sending secondaryimpulses vto the transmitting station to complete the operation of theprimary data` comparing means for comparing the' data characterrepremeans controlled by the fully conditioned operated primarycomparing means for initiating a second operation of the primarytransmitting receiving stationv to complete `the operation of thesecondary comparing means, and perforating devices at the receivingstation selected for operation by the fully operated secondarycomparingv 4 means for perforating the data character on a record.

3. In an item recording and matching system,

a transmitting station including therein primary f means to transmit aseries of impulses representing an item, and a primaryiitem matchingunit comprisinga plurality of pairs of companion relays, one of saidrelays being energized as an incident to and in accordance with thefirst operation of the transmitting means; in combination with sponsiveto the transmitted impulses, a secondary pairs of relays, one of thelatter relays being energized as an incident to and in accordance withthe gized relay of, the secondary matching 'unit for sending a series ofsecondary impulses representing the itemt the transmitting station toenergize the companion relay of the previously ener- ;lintly controlledbythe energized relays of said primary matching unit for effecting asecond'operation of the transmitting means to send a primary series ofimpulses again` to the receiving 7 item matching unit alsocomprisinga-plurality of i station to energize the companion relay toone previously energized in the secondary matching unit, perforatingdevices at the receiving station for perforating the item in a record,in accordance with the operation of the impulse responsive means, andmeans jointly controlled by the lenergized relays of said secondarymatching unit for rendering the impulse responsive means eiective to cause operation of perforating means.

4. In a data recording and verifying system, a transmitting stationincluding therein means to transmit primary impulses corresponding todata, and a primary data verifying means partly operated by and inaccordance with the rst operation of thetransmitting-means; incombination with a receiving station having means responsive to thetransmitted impulses, a secondary data verifying means partlyconditioned as an incident to and in accordance with Athe operationofthe 204 impulse responsive means, means including means to sendsecondary` pulses corresponding to the data to the transmitting stationunder the control ofthe partly operated secondary verifying means forcompleting the operation of the primary verifying means, meanscontrolledby said fully operated primary verifying means for effecting a secondloperation of thetransmitting means to send primary impulses again to thereceiving station to complete the operation of the secondary verifyingmeans, perforating means at the receiving station for perforating thedata on a record, and means rendered effective by the fully operatedsecondary verifying means for recording the data on a record inaccordance with the operation of the impulse responsive means.

,.5. In an item recording and verifying system, a transmitting stationincluding therein transmitting means to transmit impulses representing aselected item, -and a primary comparing unitA including a plurality ofsets of matching relays,

one of said relays beingenergized as an incident to and in accordancewith the rst operation of the transmitting means; in combination with areceiving station having therein receiving means for receiving saidimpulses, a secondary comparing unit also having Y sets of matchingrelays, means controlled by the receiving means in accordance with theimpulses received for ener- -gizing a relay of one o i the sets of thesecondary comparing unit, means effective upon the energiy zation ofthelatter relay for energizing another relay of the rst comparing unit,means dependent upon whether the two energized relays of the ilrstcomparing unit are in the same set or in different sets for determiningwhether a-second operation of the transmitting means is tc occur, meanseiective upon the second operation of the transmittingmeans forenergizing` another relay of the secondary comparing unit, andperforating means at the receivingvstation rendered operative inaccordancewith the operation of the impulse receiving means in ytheevent that the two relays energized in the secondary comparing'unit arein the same set for perforating the item in a record. 6. In an itemrecording and verifying system,

a transmitting station having therein transmitting means to transmitprimary impulses' representing a selected item, and a comparing. unitincluding a plurality of sets of matching relays, one of said relaysbeing operated as an incident to and in accordance with the firstoperation of the transmitting means; in combination with a receivingstation embracing therein a receiving means for receiving thetransmittedimpulses,

means controlled by thereceiving means for sending secondary impulsescorresponding to the item to energize another relay of the comparingunit, means dependent upon whether the two energized relays of thecomparing unit are in the same set or in diiferent sets for determining5 Iwhether primary impulses representing 'the selected item areto beretransmitted to thereceiving means by a second operation of thetransmitting means, and perforating means at'the receivingstationoperated under the control of 10 the receiving means upon thereception of the retransmitted primary' impulses to perforate theselected item in a record. 7. In an item recording and verifying system,a transmitting station including therein trans- 16 mitting means totransmit impulses representing a selected item; and a receiving stationhaving therein a comparing unit including a plurality of sets ofmatching relays, receiving means operated by the transmittingmeans toreceive said imzo pulses, means controlled by the receiving means inaccordance with the impulses received to enegize a relay of one of thesets of relays in the comparing' unit, means controlled by the receivingmeans to enect automatically a repeat g5 operation of the transmittingmeans to send repeat impulses corresponding to the selected item tooperate thereceiving means to energize another relay of the comparingunit, perforating means for perforating the item in a record in ac- $0cordance with the operation of the receiving means, means dependent uponwhether the two energized relays of the comparing unit are in the sameset or in different sets for'determining whether the perforating meansis to be operated $6 in accordance with the receiving means followingthe reception of the repeat impulses from the transmitting station. 8.In combination, a transmitting station including therein transmittingdevices for trans- 40 mitting primary impulses corresponding to data anda primary comparing unit with a ilrst sec# tion therein settable by'andin'l accordance with the operation of said devices; a receiving andrecording Vstation remote from the transmitting 45 unit and embracingreceiving devices receiving and operated according to the transmittedimpulses, a perforating mechanism to perforate the data represented bythe impulses in a record,` and alsoa secondary comparing unit with meansopo erated by and according to the operation of the receiving devicesfor sending-back secondary imypulses corresponding to the digit valuesto the primary'comparing unit; a second section in the latter comparingunit being responsive to said 55 secondary impulses andv coacting withsaid ilrst section according to the setting thereof for causing a repeattransmission of the primary impulses to the secondary comparing unit,and means in the latter comparing unit responsiveto the rew ception ofrepeated primary impulses for causing operation of the perforating meansto be eiected under control of and in accordance with the setting ofsaid receivingdevices.

9. In combination, a transmitting station emas bracing therein auniformly rotating transmitting commutator, and a manual' control deviceassociated therewith 'adapted upon operation to cooperate with thecommutator to transmit a predeterminednumber of control impulses; and 70a receiving station including therein a chain of relays responsive tosaid impulses and operated in succession thereby to an extentcorresponding to the number of impulses received. a visual indicatingmeans, an electromagnetic time delay 75 means set in operation bythe'iirst impulse received and effective at a subsequent time tov causethe last relay energizedL at that time to become eiective to operate thevisual indicating" means so as to indicate by a predetermined signalwhether the time delay means became eiective too early or too late, andadjustable control means for saidtime delay means arranged 9l foroneration under the control of the transmitting commutator when themanual control device at the transmitting vPstation is xoperated `forobtaining a definite timed relation between the period of operation ofthe time delay means and 5 the speed of rotation of the commutator.

JAMES W. BRYCE.

